Errata: “Determination of an abstract simple group of order $2^{7}⋅3^{6}⋅5⋅7$ holoedrically isomorphic with a certain orthogonal group and with a certain hyperabelian group” [Trans. Amer. Math. Soc. 1 (1900), no. 3, 353–370; 1500543]

Errata: “On the types of linear partial differential equations of the second order in three independent variables which are unaltered by the transformations of a continuous group” [Trans. Amer. Math. Soc. 1 (1900), no. 2, 243–258; 1500535]